A megapixel is one million pixels. It is commonly used to describe the resolution of digital cameras. For example, a 7.2 megapixel camera is capable of capturing roughly 7,200,000 pixels. The higher the megapixel number, the more detail the camera can capture. Therefore, the megapixel count is a significant specification to look for when buying a digital camera.

The SD1 is SIGMAs latest digital SLR camera which meets high requirements of professional and enthusiast photographers for all types of photography.

46 Megapixel 2416mm APS-C X3 Full-color image sensor

The 46 megapixel (4,8003,2003 layers) 2416mm APS-C X3 direct image sensor featured in the Sigma SD1 captures all primary RGB colors at each and every pixel location, ensuring the capture of full and complete color. Using three silicon-embedded layers of photo detectors, stacked vertically to take advantage of silicons ability to absorb red, green and blue light at different respective depths, it efficiently reproduces color more accurately, and offers sharper resolution, pixel for pixel, than any conventional image sensor. Since color moir is not generated, the use of a low-pass filter is not required, meaning light and color, generated by the 46 megapixel APS-C X3 direct image sensor is captured with a three-dimensional feel.

Dual TRUE II image processing engine

The SD1 incorporates a dual TRUE (Three-layer Responsive Ultimate Engine) II image processing engine which improves the processing speed and overall quality of the final image. The unique image-processing algorithm provides high resolution power and reproduces high definition images with richly graduated tones.

CF card

The SD1 adopts the TYPE I CF Card. This camera is compatible with the UDMA enabling fast processing of large amounts of data.

*It is not possible to use Microdrives and TYPE II CF cards.

11 point twin cross sensor

The autofocus system features an 11 point twin cross sensor. The shifted twin cross type sensor improves AF accuracy.

Magnesium body

The Sigma SD1 adopts a lightweight yet solid magnesium alloy body designed to withstand rough use and shocks in harsh conditions.

Weather-resistant design

Buttons and connections benefit from O-ring sealing connections to prevent dust and water getting inside the camera body.

Large, highly visible 3.0 TFT color LCD Monitor

The SD1 camera features a 3.0 inch TFT color monitor. This 460,000 pixel resolution LCD monitor benefits from a wide viewing angle, making it easy to check focusing and composition.

Optional lenses

The SD1 can be used with over 40 Sigma lenses such as ultra-wide, ultra-telephoto, macro and fisheyes which adopt the latest technology such as the FLD (F Low Dispersion) glass elements, which have the performance equal to fluorite glass, SLD glass, Aspherical lenses, Sigmas own unique Optical Stabilizer function, Hyper Sonic Motor and Sigmas Super Multi Layer Coating. They meet the various and demanding requirements of all types of photographers.

A megapixel is one million pixels. It is commonly used to describe the resolution of digital cameras. For example, a 7.2 megapixel camera is capable of capturing roughly 7,200,000 pixels. The higher the megapixel number, the more detail the camera can capture. Therefore, the megapixel count is a significant specification to look for when buying a digital camera.

The various modes in which the camera will measure light. Most DSLRs and some advanced point and shoots have the ability to meter an entire scene (matrix/evaluative) or a specific point (centerweighted/spot)

Refers to the option for the user to override the internal light meter in the camera to either OVER or UNDER expose based on middle/18% gray. This is especially useful when photographing either extremely white/bright scenes or when in very dark/dimly lit scenarios.

The ISO speed setting dictates sensitivity to light. The higher the ISO speed, the more sensitive the film or digital sensor is to light. Higher ISOs have the effect of noise in an image. The actual ISO at which the noise occurs varies from camera to camera. Low ISOs are generally used for brighter lighting conditions and high ISOs are often used for low light or action shots.

The types of files that a particular camera produces. All cameras output JPEG images, but some of the more sophisticated models will shoot in RAW mode. RAW Image Formats will vary based on manufacturer.